纤维素
嫁接
阳离子聚合
化学
吸附
高分子化学
丙烯酸
聚合物
漆酶
化学工程
有机化学
酶
单体
工程类
作者
Shuxian Shi,Robert Pelton,Qiang Fu,Songtao Yang
摘要
A new poly(acrylic acid)-grafted TEMPO (PAA-T) is compared to polyvinylamine-grafted TEMPO and free TEMPO as oxidation mediators for cellulose. The polymer-immobilized mediators require lower overall TEMPO concentrations and they restrict oxidation to the exterior surfaces of porous cellulose. On the other hand, the resulting surfaces are coated with grafted polyvinylamine and laccase, if the enzyme is used as the primary oxidant. PAA-T is anionic and does not sufficiently adsorb onto anionic cellulose to give oxidation, whereas cellulose rendered cationic by an adsorbed layer of PVAm is oxidized by PAA-T + laccase. There is no clear "best choice" mediator/primary oxidant combination for cellulose oxidation subsequent to PVAm grafting; the advantages of each mediator are summarized.
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